Why do girls play with nice guys who treated them right?

It's been a year to my breakup.
She clearly said that I was a timepass for her.
And it was her idea to date, I asked her out after a month or so.
She said she loves me then later this text when I was trying to save our relationship.
Can someone please tell me?
Why do girls play with nice guys who treated them right?
Why do girls play with nice guys who treated them right?
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